Proton AA-2120 amp FS, Detroit or Chicago.

JohnVF

Administrator
Staff member
"Where does he get all these amps?"

Behold the Proton AA-2120.

I picked this up within the last couple of years to run with the Elac speakers I had in my bedroom, but a buddy of mine bought those and I redid that whole system around my Leben amp So, its for sale!

Look at those meters! Pictures don't do these meters justice. They're REALLY pretty. I don't know a whole lot about Proton other than some connection with NAD? Or they were people from NAD? I don't know. Whatever it is, if you've heard an NAD amp this has kind of that house sound, whether there's a relation to it or not. Big, grunt, a bit thick but not too much... really a great amp. And the meters! Ok, I bought it for the meters and how much it weighed for its size, but it also good.

it works and works well. Everything lights up as it should. Nothing lights up that shouldn't.

I'll sell it locally for what I paid for it which was, I think, $200 and I also think that's a steal because...the meters! And...heavy! And ....sounds good!

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If the quads will fit in my car, and if DC offset for each channel is <20 mV, Ill buy this. Need an amp with big honkin meters and NAD has treated me quite well, zero problems and Ive got a bunch. Thanks!
 

JohnVF

Administrator
Staff member
If the quads will fit in my car, and if DC offset for each channel is <20 mV, Ill buy this. Need an amp with big honkin meters and NAD has treated me quite well, zero problems and Ive got a bunch. Thanks!
I have no idea what the DC offset is. This was serviced, I was told, 2 years ago but I don't know anything about the check-up they did, it was done prior to me purchasing it.
 
It is real easy to test, but if you dont have a multimeter or dont want to deal with it, I understand and will more than likely buy anyways if the quads will fit. Basically listen to it for 20-30 minutes (time to warm up). Then turn the volume all the way down with the source no longer playing. Set multimeter to “millivolts” then touch leads to each set of speaker outputs and note reading. From what I understand this gives a relatively good indication of the condition of the output transisters (how much use it has seen/how much life is left before sound degradation is noticeable). Seems like (according to echowars on another site) <25mV or so is “acceptable”. Best Ive gotten is my Kyocera A-910 from 85 or 86 that is something like 0.1 mV and 0.4 mV. Though my NAD 7045 has 38 mV in one channel and it sounds fine to me. I used to post all my DC offset data (over time) to this thread but all that data went buh bye. :) Amplifier Distortion, DC-Offset, and You!
 
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